package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexPatterns;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    private final StringRedisTemplate stringRedisTemplate;

    /**
     * 发送验证码
     *
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合返回错误信息
            return Result.fail("手机号格式错误！");
        }

        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(4);

        /*//4.保存验证码到session
        session.setAttribute("code", code);*/
        //4.保存验证码到Redis
        //set key value ex 120
        stringRedisTemplate.opsForValue().set(RedisConstants.LOGIN_CODE_KEY + phone, code,
                                              RedisConstants.LOGIN_CODE_TTL,
                                              TimeUnit.MINUTES);


        //5.发验证码
        log.info("发送短信验证码成功，验证码={}", code);

        //6.返回ok
        return Result.ok();
    }

    /**
     * 实现登录功能
     *
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合返回错误信息
            return Result.fail("手机号格式错误！");
        }

        /*//3.从session中获取验证码，并校验验证码
        Object cacheCode = session.getAttribute("code");
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.toString().equals(code)) {
            // 不一致报错
            return Result.fail("验证码错误");
        }*/
        //3.redis中获取并验证
        String cacheCode = stringRedisTemplate.opsForValue().get(RedisConstants.LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            // 不一致报错
            return Result.fail("验证码错误");
        }

        //4.一致，查询数据库有没有用户
        //select * from tb_user where phone = ?
        User user = lambdaQuery().eq(User::getPhone, phone).one();

        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，向mysql新增用户手机号...
            user = createUserWithPhone(phone);
        }

        /*//7.存在，将用户信息写到session中
        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));*/
        // 7.保存用户到redis中
        //7.1 生成token作为登录令牌
        String token = UUID.randomUUID().toString(true);

        //7.2 以token为key，将userDTO-->HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                                                         CopyOptions.create()
                                                                    .setIgnoreNullValue(true)
                                                                    .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));

        //7.3 保存到redis
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);

        //7.4 设置token有效期
        stringRedisTemplate.expire(tokenKey, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);

        //8.返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(SystemConstants.USER_NICK_NAME_PREFIX + RandomUtil.randomString(5));

        //2.保存用户信息
        save(user);

        return user;
    }
}
